John McCain and Barack Obama swapped self-deprecating jokes instead of campaign jabs Thursday night, the Republican saying he had replaced his team of senior advisers with "Joe the Plumber" while the Democrat claimed his own "greatest strength would be my humility."

John McCain and Barack Obama swapped self-deprecating jokes instead of campaign jabs Thursday night, the Republican saying he had replaced his team of senior advisers with "Joe the Plumber" while the Democrat claimed his own "greatest strength would be my humility."